Ethereum Foundation

# Rationale

We have only `eth_db_chaindata_compact_nonlevel0` & `eth_db_chaindata_compact_level0` regarding LevelDB compaction levels.

It would be helpful to have the gauge metric which would represent the current number of L0, L1, L2,... tables.
Now it can be monitored only within LevelDB logs. 

e.g.
```
17:32:48.421253 table@move L3@151145047 -> L4
17:32:48.501054 version@stat F·[25 380 3851 38027 101486 656155 3398169] S·7TiB[96GiB 768MiB 7GiB 75GiB 150GiB 976GiB 6TiB] Sc·[6.25 7.68 7.69 7.69 1.54 1.00 0.67]
```
```[tasklist]
### Tasks
```


This bounty is no longer available

Gauge metric to help debug LevelDB compactions?

INSTRUCTIONS

Rationale